I think adding the other plants was a good choice. It doesn't look too bad as you think it does. I'm not sure which plant that is on the left side (the long ones) but I feel like it might look better if you pushed it back into the background some more so that maybe it's on the same level as the giant anubias. Same thing with the fern attached to the rock on the left. I think it's a bit weird to me because it's elevated.